feat: implement basic BLE provision sheet widget

lib/features/ble_provision/ble_provision_sheet.dart

@@ -1,8 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
 
 import '../../data/sources/ble/ble_provisioner.dart';
 
+enum _Step { provision, done }
+
 // Shared bottom sheet used by onboarding and the main sensor screens.
 // Flow: scan → select device → enter WiFi credentials → provision → place on map.
 class BleProvisionSheet extends ConsumerStatefulWidget {
@@ -17,6 +20,7 @@ class _BleProvisionSheetState extends ConsumerState<BleProvisionSheet> {
   final _ssidController = TextEditingController();
   final _wifiPasswordController = TextEditingController();
 
+  _Step _step = _Step.provision;
   BleScanResult? _selected;
   bool _provisioning = false;
   String? _error;
@@ -41,15 +45,24 @@ class _BleProvisionSheetState extends ConsumerState<BleProvisionSheet> {
         ssid: _ssidController.text.trim(),
         wifiPassword: _wifiPasswordController.text,
       );
-      // TODO: poll localiserd until sensor appears, then prompt placement on map.
+      if (mounted) setState(() => _step = _Step.done);
-      if (mounted) Navigator.of(context).pop();
     } catch (e) {
-      setState(() => _error = e.toString());
+      if (mounted) setState(() => _error = e.toString());
     } finally {
       if (mounted) setState(() => _provisioning = false);
     }
   }
 
+  void _reset() {
+    setState(() {
+      _step = _Step.provision;
+      _selected = null;
+      _error = null;
+      _ssidController.clear();
+      _wifiPasswordController.clear();
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return DraggableScrollableSheet(
@@ -63,62 +76,163 @@ class _BleProvisionSheetState extends ConsumerState<BleProvisionSheet> {
           24,
           MediaQuery.of(context).viewInsets.bottom + 24,
         ),
-        child: ListView(
+        child: _step == _Step.done
-          controller: scrollController,
+            ? _DoneStep(
-          children: [
+                onGoToFloorPlan: () {
-            Text('Add sensor',
+                  final router = GoRouter.of(context);
-                style: Theme.of(context).textTheme.titleLarge),
+                  Navigator.of(context).pop();
-            const SizedBox(height: 16),
+                  router.go('/floorplan');
-
+                },
-            // Scan results
+                onAddAnother: _reset,
-            // TODO: StreamBuilder on _provisioner.scan() — show a list of
+                onDone: () => Navigator.of(context).pop(),
-            //       BleScanResult tiles; tapping one sets _selected.
+              )
-            const Text('Nearby ESP32 devices'),
+            : _ProvisionStep(
-            const SizedBox(height: 8),
+                scrollController: scrollController,
-            const Placeholder(fallbackHeight: 120),
+                provisioner: _provisioner,
-            const SizedBox(height: 24),
+                selected: _selected,
-
+                onSelected: (r) => setState(() => _selected = r),
-            if (_selected != null) ...[
+                ssidController: _ssidController,
-              Text('Selected: ${_selected!.name}'),
+                wifiPasswordController: _wifiPasswordController,
-              const SizedBox(height: 16),
+                provisioning: _provisioning,
-              TextField(
+                error: _error,
-                controller: _ssidController,
+                onProvision: _provision,
-                decoration: const InputDecoration(
-                  labelText: 'WiFi SSID',
-                  border: OutlineInputBorder(),
-                ),
               ),
-              const SizedBox(height: 12),
-              TextField(
-                controller: _wifiPasswordController,
-                decoration: const InputDecoration(
-                  labelText: 'WiFi password',
-                  border: OutlineInputBorder(),
-                ),
-                obscureText: true,
-              ),
-              const SizedBox(height: 16),
-            ],
-
-            if (_error != null)
-              Padding(
-                padding: const EdgeInsets.only(bottom: 12),
-                child: Text(_error!,
-                    style: TextStyle(
-                        color: Theme.of(context).colorScheme.error)),
-              ),
-
-            FilledButton(
-              onPressed: (_selected == null || _provisioning) ? null : _provision,
-              child: _provisioning
-                  ? const SizedBox.square(
-                      dimension: 20,
-                      child: CircularProgressIndicator(strokeWidth: 2))
-                  : const Text('Provision & add'),
-            ),
-          ],
-        ),
       ),
     );
   }
 }
+
+class _ProvisionStep extends StatelessWidget {
+  const _ProvisionStep({
+    required this.scrollController,
+    required this.provisioner,
+    required this.selected,
+    required this.onSelected,
+    required this.ssidController,
+    required this.wifiPasswordController,
+    required this.provisioning,
+    required this.error,
+    required this.onProvision,
+  });
+
+  final ScrollController scrollController;
+  final BleProvisioner provisioner;
+  final BleScanResult? selected;
+  final ValueChanged<BleScanResult> onSelected;
+  final TextEditingController ssidController;
+  final TextEditingController wifiPasswordController;
+  final bool provisioning;
+  final String? error;
+  final VoidCallback onProvision;
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView(
+      controller: scrollController,
+      children: [
+        Text('Add sensor', style: Theme.of(context).textTheme.titleLarge),
+        const SizedBox(height: 16),
+
+        // Scan results
+        // TODO: StreamBuilder on provisioner.scan() — show a list of
+        //       BleScanResult tiles; tapping one calls onSelected.
+        const Text('Nearby ESP32 devices'),
+        const SizedBox(height: 8),
+        const Placeholder(fallbackHeight: 120),
+        const SizedBox(height: 24),
+
+        if (selected != null) ...[
+          Text('Selected: ${selected!.name}'),
+          const SizedBox(height: 16),
+          TextField(
+            controller: ssidController,
+            decoration: const InputDecoration(
+              labelText: 'WiFi SSID',
+              border: OutlineInputBorder(),
+            ),
+          ),
+          const SizedBox(height: 12),
+          TextField(
+            controller: wifiPasswordController,
+            decoration: const InputDecoration(
+              labelText: 'WiFi password',
+              border: OutlineInputBorder(),
+            ),
+            obscureText: true,
+          ),
+          const SizedBox(height: 16),
+        ],
+
+        if (error != null)
+          Padding(
+            padding: const EdgeInsets.only(bottom: 12),
+            child: Text(error!,
+                style:
+                    TextStyle(color: Theme.of(context).colorScheme.error)),
+          ),
+
+        FilledButton(
+          onPressed: (selected == null || provisioning) ? null : onProvision,
+          child: provisioning
+              ? const SizedBox.square(
+                  dimension: 20,
+                  child: CircularProgressIndicator(strokeWidth: 2))
+              : const Text('Provision & add'),
+        ),
+      ],
+    );
+  }
+}
+
+class _DoneStep extends StatelessWidget {
+  const _DoneStep({
+    required this.onGoToFloorPlan,
+    required this.onAddAnother,
+    required this.onDone,
+  });
+
+  final VoidCallback onGoToFloorPlan;
+  final VoidCallback onAddAnother;
+  final VoidCallback onDone;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.stretch,
+      children: [
+        const Icon(Icons.check_circle_outline, size: 56),
+        const SizedBox(height: 16),
+        Text(
+          'Sensor provisioned!',
+          style: Theme.of(context).textTheme.titleLarge,
+          textAlign: TextAlign.center,
+        ),
+        const SizedBox(height: 8),
+        Text(
+          'The sensor will appear in the list once it connects to the network. '
+          'Open the floor plan to place it.',
+          style: Theme.of(context).textTheme.bodyMedium,
+          textAlign: TextAlign.center,
+        ),
+        const SizedBox(height: 32),
+        FilledButton.icon(
+          icon: const Icon(Icons.map_outlined),
+          label: const Text('Place on floor plan'),
+          onPressed: onGoToFloorPlan,
+        ),
+        const SizedBox(height: 12),
+        OutlinedButton.icon(
+          icon: const Icon(Icons.add),
+          label: const Text('Add another sensor'),
+          onPressed: onAddAnother,
+        ),
+        const SizedBox(height: 8),
+        TextButton(
+          onPressed: onDone,
+          child: const Text('Done'),
+        ),
+      ],
+    );
+  }
+}